ok, so that would mean the extension is only for 30 days. If that's the case, i stand by my original comment/question: a border bounce gets you an extra 180 days Vs a 30 day extension of stay for 1900, so why bother with the extension?
What nonsense....the "advice" you are getting is from wannabe internet lawyers who have no clue. Show me a link with one case of someone charged with such a "crime"
Just check-in online - in the process you will be asked to attest that you have all the necessary documents for entry - tick the box and you are good to go. Why anyone bothers with the check-in counter is beyond me.
I've never heard of an immigration officer "reassessing visa rights" of visa holders. Their concern is generally with those entering visa exempt. I expect changes to the DTV to eliminate the apparent loophole that is issuing 5 year visas to attend a 1 month cooking class or single medical appointment. But I think those that already have DTV's should be safe.